Abstract: A syringe, comprising: a barrel, comprising a needle accommodating-cavity and a plunger accommodating-cavity; a pull-back element, accommodated in the needle accommodating-cavity, wherein a needle is mounted on the pull-back element; a plunger, disposed in the plunger accommodating-cavity and movable between pushed-in and pulled-out position, wherein a head portion of the plunger enters the cavity of the pull-back element proximate to the plunger accommodating-cavity and is engaged therein in the pushed-in position; a biasing force structure, disposed in the cavity of the pull-back element and/or the head portion of the plunger, wherein the head portion of applies a biasing force on the pull-back element through the biasing force structure, and when the head portion is moved to the pulled-out position, the biasing force structure causes the pull-back element and the needle to tilt with respect to the axis of the barrel through the biasing force.

Abstract: A syringe includes a syringe barrel defining a needle receiving chamber and a plunger receiving chamber, a pull-back member received in the needle receiving chamber, and a plunger received in the plunger receiving chamber and comprising an end defining a first receiving chamber and a second receiving chamber. The pull-back member is configured to mount a needle thereto and comprising an engagement portion. The first receiving chamber has a sectional area that is less than a sectional area of the second receiving chamber, and the first receiving chamber has a closed curved surface. The engagement portion is configured to pass through the first receiving chamber and snap-fit into the second receiving chamber when the plunger is inserted into the pull-back member.

Abstract: A syringe assembly includes a plunger assembly, a syringe body, and a needle. The plunger assembly includes a plunger rod, a spring, a plunger base, and a plunger plug. The plunger rod includes a first end member having a first stepped part positioned in an inner wall thereof, a second end member, and a first accommodating room. The plunger base includes a plunger body, a projection, a second stepped part, a plunger member, and a locating member. The plunger body is received in the first accommodating room, and the projection abuts against the first end member. The spring is arranged around the plunger body and positioned between the first stepped part and the second stepped part. The plunger plug is mounted to the second end member, and defines a fixing groove. The syringe body includes a needle cannula, a needle base, a fixing pole, and a fixing valve. The plunger assembly is received in the needle cannula. The needle base is mounted to the needle cannula. The fixing valve is received in the needle base.

Abstract: A syringe, comprising: a barrel, comprising a needle accommodating-cavity and a plunger accommodating-cavity; a pull-back element, accommodated in the needle accommodating-cavity, wherein a needle is mounted on the pull-back element; a plunger, disposed in the plunger accommodating-cavity and movable between pushed-in and pulled-out position, wherein a head portion of the plunger enters the cavity of the pull-back element proximate to the plunger accommodating-cavity and is engaged therein in the pushed-in position; a biasing force structure, disposed in the cavity of the pull-back element and/or the head portion of the plunger, wherein the head portion of applies a biasing force on the pull-back element through the biasing force structure, and when the head portion is moved to the pulled-out position, the biasing force structure causes the pull-back element and the needle to tilt with respect to the axis of the barrel through the biasing force.

Abstract: A syringe assembly includes a plunger assembly, a syringe body, and a needle. The plunger assembly includes a plunger rod, a spring, a plunger base, and a plunger plug. The plunger rod includes a first end member having a first stepped part positioned in an inner wall thereof, a second end member, and a first accommodating room. The plunger base includes a plunger body, a projection, a second stepped part, a plunger member, and a locating member. The plunger body is received in the first accommodating room, and the projection abuts against the first end member. The spring is arranged around the plunger body and positioned between the first stepped part and the second stepped part. The plunger plug is mounted to the second end member, and defines a fixing groove. The syringe body includes a needle cannula, a needle base, a fixing pole, and a fixing valve. The plunger assembly is received in the needle cannula. The needle base is mounted to the needle cannula. The fixing valve is received in the needle base.

Abstract: A syringe assembly includes a plunger assembly, a syringe body, and a needle. The plunger assembly includes a plunger rod, a spring, a plunger base, and a plunger plug. The plunger rod includes a first end member having a first stepped part positioned in an inner wall thereof, a second end member, and a first accommodating room. The plunger base includes a plunger body, a projection, a second stepped part, a plunger member, and a locating member. The plunger body is received in the first accommodating room, and the projection abuts against the first end member. The spring is arranged around the plunger body and positioned between the first stepped part and the second stepped part. The plunger plug is mounted to the second end member, and defines a fixing groove. The syringe body includes a needle cannula, a needle base, a fixing pole, and a fixing valve. The plunger assembly is received in the needle cannula. The needle base is mounted to the needle cannula. The fixing valve is received in the needle base.

Abstract: A syringe assembly includes a plunger assembly, a syringe body, and a needle. The plunger assembly includes a plunger rod, a spring, a plunger base, and a plunger plug. The plunger rod includes a first end member having a first stepped part positioned in an inner wall thereof, a second end member, and a first accommodating room. The plunger base includes a plunger body, a projection, a second stepped part, a plunger member, and a locating member. The plunger body is received in the first accommodating room, and the projection abuts against the first end member. The spring is arranged around the plunger body and positioned between the first stepped part and the second stepped part. The plunger plug is mounted to the second end member, and defines a fixing groove. The syringe body includes a needle cannula, a needle base, a fixing pole, and a fixing valve. The plunger assembly is received in the needle cannula. The needle base is mounted to the needle cannula. The fixing valve is received in the needle base.